their default values. A status byte is returned
immediately after issuing a LOCK command.
This byte reflects the value of the LOCK bit set
by the command byte.
COMPATIBILITY
The FDC37C669 was designed with software
compatibility in mind. It is a fully backwards-
compatible solution with the older generation
765A/B disk controllers.
The FDC also
ENHANCED DUMPREG
implements on-board registers for compatibility
with the PS/2, as well as PC/AT and PC/XT,
The DUMPREG command is designed to
support system run-time diagnostics and
application software development and debug.
To accommodate the LOCK command and the
enhanced PERPENDICULAR MODE command
the eighth byte of the DUMPREG command has
been modified to contain the additional data
from these two commands.
floppy disk controller subsystems. After
a
hardware reset of the FDC, all registers,
functions and enhancements default to a PC/AT,
PS/2 or PS/2 Model 30 compatible operating
mode, depending on how the IDENT and MFM
bits are configured by the system bios.
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SMSC [ SMSC CORPORATION ]
